5.1.3 - Titration

Question 1

What is titration used for !?

Answer 1

. Titration is a practical method used to measure the volume of acid needed to neutralise a particular volume of alkali

Question 2

What two special pieces of equipment are used in titrations !?

Answer 2

. Volumetric pipette
. Burette (measures any volume to the nearest 0.05 cm³)

Question 3

What does the setup of a titration look like ?!

Answer 3

1. Use of volumetric pipette to place 25 cm³ of the unknown alkali into a conical flask.
2. Add a few drops of either methyl-orange or phenolphthalein indicator to the flask.
3. Fill a burette with known acid clamp it above the conical flask

Question 4

What is the use of a titration !?

Answer 4

To work out the volume of acid needed to neutralise the alkaline:

1. Measure the initial volume of the nine acid on the burette
2. Use the burette to add acid into the conical flask drop by drop and swirling the flask.
3. Close a tab as soon as the colour in the conical flask changes.
4. Measure the final volume of the known acid on the burette
5. Calculate titre (final vol - initial vol)
6. Repeat to get concordant titres.

Question 5

What should your results table look like for titration?

Answer 5

Question 6

Always use grid method !!!